/* Example usage: The parameters of starfield_init are - the id of a type="hidden" field to store the result - the maximum number of stars to display - the src of the "white" star - the star that is turned off. - the src of the bright star - the star that is turned on. The hidden field also can contain the original value. And the parent of the hidden field will contain all the stars, so it should be in a div or span or td.